EP2492496A1 - Lame de rotor d'éolienne dotée d'une profondeur de lame variable - Google Patents

Lame de rotor d'éolienne dotée d'une profondeur de lame variable Download PDF

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Publication number
EP2492496A1
EP2492496A1 EP20110001581 EP11001581A EP2492496A1 EP 2492496 A1 EP2492496 A1 EP 2492496A1 EP 20110001581 EP20110001581 EP 20110001581 EP 11001581 A EP11001581 A EP 11001581A EP 2492496 A1 EP2492496 A1 EP 2492496A1
Authority
EP
European Patent Office
Prior art keywords
blade
depth
wind turbine
longitudinal section
length
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP20110001581
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German (de)
English (en)
Other versions
EP2492496B1 (fr
Inventor
Gunther Reinald Fischer
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nordex Energy SE and Co KG
Original Assignee
Nordex Energy SE and Co KG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
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Application filed by Nordex Energy SE and Co KG filed Critical Nordex Energy SE and Co KG
Priority to EP11001581.5A priority Critical patent/EP2492496B1/fr
Priority to DK11001581.5T priority patent/DK2492496T3/en
Priority to ES11001581.5T priority patent/ES2587829T3/es
Priority to US13/359,908 priority patent/US20120219423A1/en
Priority to CN2012100438661A priority patent/CN102650268A/zh
Publication of EP2492496A1 publication Critical patent/EP2492496A1/fr
Application granted granted Critical
Publication of EP2492496B1 publication Critical patent/EP2492496B1/fr
Revoked legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
    • F03D—WIND MOTORS
    • F03D1/00—Wind motors with rotation axis substantially parallel to the air flow entering the rotor 
    • F03D1/06—Rotors
    • F03D1/0608—Rotors characterised by their aerodynamic shape
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
    • F05B2240/00—Components
    • F05B2240/20—Rotors
    • F05B2240/30—Characteristics of rotor blades, i.e. of any element transforming dynamic fluid energy to or from rotational energy and being attached to a rotor
    • F05B2240/301—Cross-section characteristics
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/70—Wind energy
    • Y02E10/72—Wind turbines with rotation axis in wind direction

Definitions

  • the invention relates to a wind turbine rotor blade having a blade root, a blade tip and a blade depth varying over the length of the rotor blade, which blade reaches a maximum blade depth at a longitudinal position between the blade root and the blade tip.
  • the wind turbine rotor blade has a blade root, a blade tip, and a blade depth varying over the length of the blade that reaches a maximum blade depth at a longitudinal position between the blade root and blade tip, the blade depth being in an outer longitudinal section extending over a length of 20% more of the blade length ranges from 20% to 30% of the maximum blade depth.
  • the wind turbine rotor blade according to the invention is characterized by an outer longitudinal section in which the blade depth varies less or remains approximately constant compared to conventional rotor blades. The blade depth deviates more in the outer longitudinal section of the theoretically optimal course than usual.
  • the blade depth in the entire outer longitudinal section is relatively small compared to conventional rotor blades.
  • the feature that the longitudinal section is an outer longitudinal section means that the longitudinal section is located at a distance from the blade root, that is to say radially relative to the outside relative to a rotor axis.
  • the pitch of the outer longitudinal section to the blade root may be, for example, 30% or more, 40% or more, 50% or more, 60% or more, or 70% or more of the blade length.
  • the maximum blade depth can be at a single, particular longitudinal position from which the blade depth decreases in both directions. However, the maximum blade depth can also be present over a certain longitudinal section, in which the blade depth remains constant. With the blade length is always the total length of the rotor blade, from the blade root to the blade tip meant.
  • Another advantage is that because of the smaller blade depth in the outer longitudinal section smaller Beulfelder than in a conventionally shaped rotor blade are present and thereby additional core material can be saved. This reduces the mass of the rotor blade, which further reduces the mechanical loads that occur. The reduced mechanical loads are expressed in particular in reduced bending moments at the blade root. Because of the small blade depth in the outer longitudinal section, it is also possible to operate the rotor blade with a higher speed number. This can reduce the load on the drive train in the partial load range.
  • the blade depth in the outer longitudinal section is in the range of 22% to 30% or in the range of 22% to 28% of the maximum Sheet depth. Accordingly, the outer longitudinal section has an even more uniform course of the blade depth. As a result, the described advantages of the invention are achieved to an even greater extent.
  • the outer longitudinal portion extends over a length of 25% or more of the sheet length or over a length of 28% or more of the sheet length. This too can reinforce the described advantageous effects.
  • the relative sheet thickness varies in the region of the outer longitudinal section and is greater at the blade root-side end of the outer longitudinal section than at the blade-tip-side end of the outer longitudinal section.
  • the relative sheet thickness is the ratio of sheet thickness and sheet depth.
  • the relative sheet thickness in an outer region is usually substantially constant and is often about 18%.
  • the relative sheet thickness increases toward the blade root end of the outer longitudinal portion, at approximately uniform blade depth. Compared to a conventional rotor blade, by reducing the blade depth in the outer longitudinal portion toward the blade root side end of the outer longitudinal portion, a relatively larger sheet thickness despite an approximately unchanged absolute sheet thickness is achieved.
  • the height of a flexural torsional box imparting its strength to the wind turbine rotor blade need not or not be substantially reduced compared to a conventional wind turbine rotor blade. It can therefore be achieved a sufficient strength, without making radical structural changes in the support structure of the wind turbine rotor blade.
  • the relative sheet thickness at the blade root end of the outer longitudinal section is greater by 10% or more than at the blade tip side end the outer longitudinal section.
  • the blade depth in a central longitudinal section extending over 30% or less of the blade length decreases from 80% or more of the maximum blade depth to 40% or less of the maximum blade depth.
  • the central longitudinal section is spaced from both the blade root and the blade tip.
  • the distance of the central longitudinal section from the blade root may be, for example, 20% or more, preferably 30% or more of the blade length.
  • the pitch of the central longitudinal portion from the blade tip may be, for example, 20% or more, 30% or more, or 40% or more of the blade length.
  • a relatively rapid change of the blade depth occurs compared to the blade depth profile of conventional rotor blades.
  • This rapid transition means that the relatively narrow rotor blade in the outer longitudinal section merges within a relatively short longitudinal section into a relatively wide, inner longitudinal section.
  • This relatively abrupt transition deviates from the conventional blade depth profile and leads to the fact that the total available blade area, despite the relatively narrow outer longitudinal portion does not or not substantially lower than in a conventional rotor blade.
  • the relatively large blade depth at the blade root-side end of the central longitudinal section and the areas of the rotor blade adjoining it inwardly have a positive effect on the absorbed power, but only relatively slightly increases the mechanical loads that occur. Experiments have shown that the described rapid transition of the blade depth further favors an optimal compromise between power consumption and load.
  • a wind turbine rotor blade having a blade root, a blade tip and a blade depth varying over the length of the rotor blade which reaches a maximum blade depth at a longitudinal position between the blade root and the blade tip the blade depth in a central longitudinal section extending over 30% or less of the blade length decreases from 80% or more of the maximum blade depth to 40% or less of the maximum blade depth.
  • the blade depth in the central longitudinal section decreases from 80% or more of the maximum blade depth to 40% or less of the maximum blade depth, and / or the blade depth decreases to 35% or less of the maximum blade depth in the central longitudinal section and / or the blade depth decreases to 30% or less of the maximum blade depth in the central longitudinal section.
  • the central longitudinal section extends over 25% or less of the sheet length or over 20% or less of the sheet length. All of these embodiments can enhance the described positive effects of the relatively rapid transition of the blade depth in the central longitudinal section.
  • the blade depth in an inner longitudinal section extending over 20% or more of the blade length is greater than 88% of the maximum blade depth.
  • the blade depth in the inner longitudinal portion is relatively large throughout and substantially constant compared to conventional rotor blades.
  • the power consumption is improved in the inner longitudinal section, without having to increase the absolute depth of the sheet significantly.
  • the feature that the longitudinal section is an inner longitudinal section means that the longitudinal section is in a relative large distance from the blade tip. This may for example be 50% or more, 60% or more or 70% or more of the length of the sheet.
  • this embodiment i. said blade depth in the inner longitudinal portion, regardless of the described embodiment of an outer and / or middle longitudinal portion is useful and is suitable for achieving the above object.
  • the object is accordingly also achieved by a wind turbine rotor blade having a blade root, a blade tip and a blade depth varying over the length of the rotor blade which reaches a maximum blade depth at a longitudinal position between the blade root and the blade tip, the blade depth being in an inner longitudinal section of the rotor blade, which exceeds 20% or more of the blade length, is greater than 88% of the maximum blade depth.
  • the outer longitudinal section, the middle longitudinal section and / or the inner longitudinal section do not overlap.
  • the longitudinal sections mentioned can also directly adjoin one another or be at a distance from one another.
  • the rotor blade is thus clearly in the several longitudinal sections, each of which has a specific function, articulated.
  • Wind turbine rotor blade 10 shown has a blade root 12 and a blade tip 14.
  • the wind turbine rotor blade 10 has a substantially circular cross-section and is prepared for attachment to a rotor hub, not shown.
  • a flange also not shown in the figure.
  • the circular cross-section at the blade root 12 merges with increasing distance from the blade root 12 in an aerodynamic profile.
  • the rotor blade At a first longitudinal position 16, the rotor blade has a maximum blade depth 18. This is approximately 3.3 m in the illustrated embodiment.
  • the blade length 20 of the rotor blade shown is approximately 42 m.
  • FIG. 1 Moreover, an outer longitudinal section 22, a middle longitudinal section 24 and an inner longitudinal section 26 are drawn in.
  • the outer longitudinal section 22 extends over 20% or more of the sheet length 20.
  • the sheet depth in this outer longitudinal section 22 is consistently in the range from 20% to 30%. the maximum blade depth 18.
  • the central longitudinal portion 24 extends over 30% or less of the blade length 20.
  • the blade depth increases from 80% or more of the maximum blade depth 18 at the blade root end of the central longitudinal portion 24 to 40% or less of the maximum blade depth 18 at the blade tip side End of the central longitudinal section 24 from.
  • the inner longitudinal section 26 extends over 20% or more of the blade length 20. In this inner longitudinal section 26, the blade depth is consistently greater than 88% of the maximum blade depth 18.
  • the outer longitudinal section 22, the central longitudinal section 24 and the inner longitudinal section 26 do not overlap and are spaced from each other in the example.
  • FIG. 2 shows a conventional wind turbine rotor blade 28, which formed the starting point for the invention, in one of FIG. 1 corresponding view.
  • the direct comparison shows that the maximum blade depth 30 is less than the maximum blade depth 18 of the wind turbine rotor blade 10 according to the invention. It is approximately 3 m.
  • the outer longitudinal section 22 of the wind turbine rotor blade 10 according to the invention has a smaller and less varying blade depth than a corresponding longitudinal section of the conventional wind turbine rotor blade 28.
  • the central longitudinal section 24 of the wind turbine rotor blade 10 according to the invention also increases the blade depth towards the blade tip 14 substantially faster than in a comparable longitudinal section of the conventional wind turbine rotor blade 28.
  • the inner longitudinal section 26 of the wind turbine rotor blade 10 according to the invention has a more uniform and greater blade depth than a comparatively arranged longitudinal section of the conventional wind turbine rotor blade 28.
  • the relative blade depth t is plotted against the radius r in the dashed curve 32 for the conventional wind turbine rotor blade 28 FIG. 2 and in the solid curve 34 for the wind turbine rotor blade 10 according to the invention FIG. 1 ,
  • the blade depth is shown normalized to 100%, ie for the curve 32 relative to the maximum blade depth 30 of the wind turbine rotor blade 28 and for the curve 34 relative to the maximum Blade depth 18 of the wind turbine rotor blade 10.
  • Plotted on the x-axis is the respective longitudinal position along the length of the blade, based on the distance from a rotor axis and normalized. 100% corresponds to the radial position of the respective blade tip. Since the blade root 12 of the wind turbine rotor blade 28 is located at a relatively small distance from the rotor axis of about 1 m, the percentage scale on the X-axis substantially corresponds to the percentage position relative to 100% of the blade length.
  • the outer longitudinal section 22 extends from a radial position of about 70% of the blade length to a radial position of about 90% of the blade length. Within this outer longitudinal section 22, the blade depth decreases from a value of 28% to a value of 22%.
  • the central longitudinal portion 24 extends from a radius position of 38% to a radius position of 68%. Within this central longitudinal section 24, the blade depth decreases from a value of about 85% to a value of less than 30%.
  • the inner longitudinal portion 26 extends from a radius position of about 15% to a radius position of about 35%. Within this inner longitudinal section 28, the blade depth is continuously more than about 90% of the maximum blade depth.
  • a comparison of the two curves 32 and 34 shows that the rotor blade 10 according to the invention has a larger and more uniform blade depth in the inner longitudinal section 26.
  • the blade depth is significantly lower than in the conventional rotor blade and changes only slightly.
  • the maximum blade depth 18 of the wind turbine rotor blade 10 is approximately 10% greater than the maximum blade depth 30 of the wind turbine rotor blade 28.
  • the total area of the two wind turbine rotor blades 10 and 28 are substantially the same size. This is also helped by the fact that the wind turbine rotor blade 10 has an overall length that is about 2 m greater than the wind turbine rotor blade 28. This is also known in the art FIG. 3 not recognizable, since the blade length or the maximum radius of the two wind turbine rotor blades 10, 28 is normalized to 100%.
EP11001581.5A 2011-02-25 2011-02-25 Pale de rotor d'éolienne dotée d'une profondeur de lame variable Revoked EP2492496B1 (fr)

Priority Applications (5)

Application Number Priority Date Filing Date Title
EP11001581.5A EP2492496B1 (fr) 2011-02-25 2011-02-25 Pale de rotor d'éolienne dotée d'une profondeur de lame variable
DK11001581.5T DK2492496T3 (en) 2011-02-25 2011-02-25 Wind energy installation rotor blade having varying-depth leaf
ES11001581.5T ES2587829T3 (es) 2011-02-25 2011-02-25 Pala de rotor de planta de energía eólica con profundidad de pala variable
US13/359,908 US20120219423A1 (en) 2011-02-25 2012-01-27 Wind Turbine Rotor Blade with Varying Blade Depth
CN2012100438661A CN102650268A (zh) 2011-02-25 2012-02-24 叶片深度变化的风力涡轮机转子叶片

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP11001581.5A EP2492496B1 (fr) 2011-02-25 2011-02-25 Pale de rotor d'éolienne dotée d'une profondeur de lame variable

Publications (2)

Publication Number Publication Date
EP2492496A1 true EP2492496A1 (fr) 2012-08-29
EP2492496B1 EP2492496B1 (fr) 2016-06-08

Family

ID=44262955

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Application Number Title Priority Date Filing Date
EP11001581.5A Revoked EP2492496B1 (fr) 2011-02-25 2011-02-25 Pale de rotor d'éolienne dotée d'une profondeur de lame variable

Country Status (5)

Country Link
US (1) US20120219423A1 (fr)
EP (1) EP2492496B1 (fr)
CN (1) CN102650268A (fr)
DK (1) DK2492496T3 (fr)
ES (1) ES2587829T3 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11781522B2 (en) 2018-09-17 2023-10-10 General Electric Company Wind turbine rotor blade assembly for reduced noise
US20200088161A1 (en) * 2018-09-17 2020-03-19 General Electric Company Wind Turbine Rotor Blade Assembly for Reduced Noise

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE29912737U1 (de) * 1999-07-21 1999-10-07 Hafner Edzard Windkraftanlage mit leeseitig angeordnetem Rotor
JP2005315094A (ja) * 2004-04-27 2005-11-10 Zephyr Corp 風車翼の製造方法、風車翼および風力発電装置
WO2006090215A1 (fr) 2005-02-22 2006-08-31 Vestas Wind Systems A/S Aile d'eolienne
JP2008232141A (ja) * 2007-02-22 2008-10-02 Toray Ind Inc 風車翼ならびにその成形金型および製造方法
WO2010033018A2 (fr) * 2008-09-19 2010-03-25 Cortenergy Bv Eolienne dotée d'extrémités à faible induction

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4976587A (en) 1988-07-20 1990-12-11 Dwr Wind Technologies Inc. Composite wind turbine rotor blade and method for making same
US6503058B1 (en) * 2000-05-01 2003-01-07 Zond Energy Systems, Inc. Air foil configuration for wind turbine
EP1978245A1 (fr) * 2007-04-04 2008-10-08 Siemens Aktiengesellschaft Agencement optimisé de pales de rotor d'éolienne
WO2011056767A2 (fr) * 2009-11-03 2011-05-12 Sepstar, Inc. Pale de turbine éolienne

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE29912737U1 (de) * 1999-07-21 1999-10-07 Hafner Edzard Windkraftanlage mit leeseitig angeordnetem Rotor
JP2005315094A (ja) * 2004-04-27 2005-11-10 Zephyr Corp 風車翼の製造方法、風車翼および風力発電装置
WO2006090215A1 (fr) 2005-02-22 2006-08-31 Vestas Wind Systems A/S Aile d'eolienne
JP2008232141A (ja) * 2007-02-22 2008-10-02 Toray Ind Inc 風車翼ならびにその成形金型および製造方法
WO2010033018A2 (fr) * 2008-09-19 2010-03-25 Cortenergy Bv Eolienne dotée d'extrémités à faible induction

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
HAU ERICH ED - HAU E: "Windkraftanlagen, Ausgefuehrte Rotorblattformen", 1 January 1996, WINDKRAFTANLAGEN. GRUNDLAGEN, TECHNIK, EINSATZ, WIRTSCHAFTLICHKEIT, BERLIN : SPRINGER, DE, PAGE(S) 113 - 118, ISBN: 978-3-540-57430-9, XP002174275 *

Also Published As

Publication number Publication date
ES2587829T3 (es) 2016-10-27
DK2492496T3 (en) 2016-09-19
CN102650268A (zh) 2012-08-29
EP2492496B1 (fr) 2016-06-08
US20120219423A1 (en) 2012-08-30

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